wesselmann



BRUNO \VESSELMANN, OF GOTTINGEN, GERMANY.

SCISSORS OR SHEARS.

SPECIFICATION forming part of Letters Patent No. 579,085, dated March 16, 1897.

Application filed June 4, 1896. Serial No. 594,295. (NamodelJ corresponding direction with the joint or joint part in which sits the pivot or screw. In the shears forming the subject of this invention one or both of the blades are transposed or twisted relatively to the joint and the cutting edges are formed by inclines or bevels lying in a plane with the inner joint faces, the

blades extending straight throughout the wholelength or also so shaped that one or both blades are bent or twisted spirally, about a quarter-turn or less, from the point to the joint, so that at the point the twisted blade extends or nearly extends in the same direction as the other blade, whether bent or twisted, while toward the joint the blade extends in a vertical or nearly vertical direction relatively to the position of the point portion.

In the annexed drawings, illustrating the invention, Figures 1, 2, and 3 show shears with a straight and a spiral blade, the latter of different degreesof twist or curvature. Fig. 1 is a section along at at, Fig. 1. Fig. 1 is a section along as 00, Fig. 1. Fig. 1 is a section along x 00 Fig. 1. Fig. 4 is a plan view of shears with both blades spirally shaped. Fig. 5 is an end or point view of Fig. 4.

While in former shears the blades, in consequence of concaving or outward bending, spring and at the cutting edges pass with pressure over one another by the bolt pressing the blades against one another, in the present construction the shear-blades a and b have no pressure against one another.

The blades from the back to the cutting edge retain about the same thickness, and the edge or cutting portion of each blade is formed by a short inclination or bevel, as n or n, Figs; 1 to 1.

In Fig. 1 the blade to is bent toward the left. The point 8 thereof lies almost in the same direction or plane with the point 3 of the flat blade I), and the blade at then turns or curves gradually upward to the joint 2', Figs. 1, 1,

1 and 1, where it occupies a nearly vertical position relatively to the other blade I).

The shears of Figs. 2 and 3 have a blade with curvature extending to the right, whereby the latter, especially in Fig. 3, is spiral in a less degree than in the case of the shears of Fig. 1.

From Figs. 4 and 5 it can be seen how the blades extend relatively to one another when each blade is spirally formed.

Scissors or shears constructed according to the principle of the foregoing invention possess decided advantages. The cutting edges by simply grinding the bevels or inclines can in the simplest way be kept in cutting condition, while the strong blades cannot yield or bend in cutting; and this is noticeably prevented in the case of the spirally-shaped blade, since it is materially stiffened by the bending or twist. The position of the blades during use relatively to one another in the case of spirally-shaped blades, because of the twist or bend of the blades from the joint to the point, is equally favorable and more advantageous than in former shears. The severed parts of the material to be cut pass easily back under the blades, as the latter offer slight hindrance. Slipping of the work on the approach of the cutting edges does not readily occur, as the edges from back to front continually grip the same at an angle suitable for shearing, that is, at such an angle at which there is no or only a very slight tendency for pushing the work forward.

The shears can be produced with little labor, therefore cheaply. They retain the edge and can, moreover, easily be resharpened by simply grinding the narrow bevels forming the edge. v

WVhat I claim as new, and desire to secure by Letters Patent, is

Scissors or shears comprising a blade having a cutting edge of spiral or screw-threaded twist or shape, the main faces of the blades at the point having a corresponding direction, and passing to vertical or approximately vertical position at the joint, substantially as described.

In testimony whereof I have hereunto set my hand in the presence of two subscribing witnesses.

, BRUNO WESSELMANN. Witnesses:

W. HAUPT,

1. Ron. WALDER. 

